Question

java 线程死锁问题

package thread;
//死锁
public class TestDeadLock implements Runnable{
private int i = 1;
public static Object o1 = new Object();
public static Object o2 = new Object();
public void run(){
System.out.println(i);
if(i==1){
synchronized (o1) {
try {
//Thread.sleep(10000);
} catch (Exception e) {

}
}
synchronized (o2) {
System.out.println("先o1");
}
}
if(i==0){
synchronized (o2) {
try {
//Thread.sleep(10000);
} catch (Exception e) {

}
}
synchronized (o1) {
System.out.println("xian o2");
}
}
}
public static void main(String[] args) {
TestDeadLock td1 = new TestDeadLock();
TestDeadLock td2 = new TestDeadLock();
td1.i=1;td2.i=0;
Thread t1 = new Thread(td1);
Thread t2 = new Thread(td2);
t1.start();t2.start();
}
}
这个程序是在培训课上摘抄的，为什么我在Eclipse运行没有产生死锁现象。

Answer 1

当然不会死锁，i=1时候o1
加了锁，释放后才对o2枷锁，i=2是相反 不会造成等待，要是发生死锁应该这么写

synchronized (o1) {
try {
Thread.sleep(10000);
} catch (Exception e) { }

synchronized (o2) {
System.out.println("先o1");
}
}
下面的也这样，这样才会造成相互等待

Answer 2

//Thread.sleep(10000); 注释掉了怎么会死锁呢？